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MSP430 real-time rtimer support using timerb1

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adamdunkels 2007-04-03 19:03:09 +00:00
parent 1e950af492
commit 00645113e5
2 changed files with 145 additions and 0 deletions
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99
cpu/msp430/rtimer-arch.c Normal file
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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: rtimer-arch.c,v 1.1 2007/04/03 19:03:09 adamdunkels Exp $
*/
/**
* \file
* Native (non-specific) code for the Contiki real-time module rt
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <io.h>
#include <signal.h>
#include "sys/rtimer.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
interrupt(TIMERB1_VECTOR) timerb1 (void) {
if(TBIV == 2) {
rtimer_run_next();
}
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_init(void)
{
dint();
/* Select SMCLK (2.4576MHz), clear TAR */
/* TACTL = TASSEL1 | TACLR | ID_3; */
/* Select ACLK 32768Hz clock, divide by 8 */
TBCTL = TBSSEL0 | TBCLR | ID_3;
/* Initialize ccr1 to create the X ms interval. */
/* CCR1 interrupt enabled, interrupt occurs when timer equals CCR1. */
TBCCTL1 = CCIE;
/* Interrupt after X ms. */
/* TBCCR1 = INTERVAL;*/
/* Start Timer_A in continuous mode. */
TBCTL |= MC1;
BCSCTL1 &= ~(DIVA1 + DIVA0); /* remove /8 divisor from ACLK again */
/* Enable interrupts. */
eint();
}
/*---------------------------------------------------------------------------*/
void
rtimer_arch_schedule(rtimer_clock_t t)
{
PRINTF("rtimer_arch_schedule time %u\n", t);
TBCCR1 = t;
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
rtimer_arch_now(void)
{
return TBCCR1;
}
/*---------------------------------------------------------------------------*/

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cpu/msp430/rtimer-arch.h Normal file
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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: rtimer-arch.h,v 1.1 2007/04/03 19:03:10 adamdunkels Exp $
*/
/**
* \file
* A brief description of what this file is.
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __RTIMER_ARCH_H__
#define __RTIMER_ARCH_H__
#define RTIMER_ARCH_SECOND 4096
#endif /* __RTIMER_ARCH_H__ */